Lead pencil and like polishing machine



Nov. 8, 1932. F. EHRHARDT ET AL I LEAD PENCIL AND LIKE POLISHING MACHINEFiled Nov. 10, 1930 2 Sheets-Sheet 1 fnwn for:

Nov. 8;1932. F. EHRHARDT ET AL LEAD PENCIL AND LIKE POLISHING MACHINE 2'Sheets-Sheet 2 Filed Nov. 10. 19550 Patented Nov. 8,1932

UNITE-D s 'r ar ss P -rE -r j os g i rnrnnnrorrnnnnannr hm) onRrs'rIAnnonnnnior iIiTUBEllIBEltGQ i i IiE AD PENCIL Ann LIKE rorrsnrne'Mimi-Iran I Application filed November 10,1930, Serial No.494,813,.andin Germany 1111 .22, 1930;

This invention relates to a machine for polishing lead pencils and thelike and of the kind wherein the articles are automatically returned tothe polishing apparatus for re- 5 newedtreatment, and the inventionconsists in the provision of a conveying element moving in a verticalplane in front of and at,

right angles to guide-ways along which the pencils are delivered fromand fed to the- 11) polishing apparatusysa-id conveying element beingprovided with pivot-ally suspended, weight-balanced hoppers whichit-passes up through the delivery guide-way for taking pencilstherefrom'and down through the feed guide-way for depositing the pencilson the latter. 7

By this arrangement the return of the aricles to the polishing apparatuswill beeffected in a simple, smooth and efficient manner.

Fig. l of the accompanying drawings rep-' resents a side View themachine, Fig. 2 is a froneview of the same, Fig. 3 is a top view of themachine, Fig. i is a cross section of one of the guideways, and t -Fig.5 is a side view on an enlarged scale of one of the hoppers. 3U Themachine'comprises a principal frame 1 carrying a polishing apparatus 3through of the essential parts of which the lead pencils or similar rodshaped articles are pushed in lniown manner from a hopper 2 on to anendless travelling drying apron 5. The latter consists of two spacedbands which are guided and moved by rollers t and 6. The shaft carryingthe rollers 6 also carries a vaned wheel 9 the vanes of which engagebetween the bands 5 andbetween the pencils and ensure a correct delivery of the latter on an endlessconveying apron arranged under theapron 5 and travelling in the opposite direction. A guard plate 7embraces the outer part of the wheel 9 and retains the'pencils betweenthe vanes until they reach the proper delivery position. The apron 10 isguided on and moved by rollers 8 and I l-and is supported either byrollers 12 or by table top '13. The

apron '10 delivers the pencils ontoa guide- 7 bya frame, 17.

way 14" co npes ed of two spaced angular sectional form of theguide-wayslfl andl h illustrated in Fig. 4.

Arranged in front of the guideways 14 and c l5 is an endlessiconveyingelement 18 which, is guided by rollers in arectangular path and I in avertical plane at right angles, to the guide-ways, the guide rollers"being carried ;Horizontal shafts 20, held rotatably in bearings 21iii-the conveying ele: ment 18, carry hoppers 19. which arejmoved by theconveying elenientQ-jup through the guide-way 14 and: down through-theguideway 15. maintain the hoppers in an uprightpo'sition.

Eachhopper 19 consists of a pair of diverg ing wingsjbetweenwhich thepencils uare oaughtas. the hopper passesjup betweenthe members ,oftheguide-way- 14;; ,Thus filled V v with pencils the hopper ascendswiththecon-.

veying element at one sideof the machine and 7 descends at the othersidethereo l .where it deposits the pencilson the guide-way 15 as itpasses between the members of the latter. The weights 22 are bevelledand the sides 19.

of the hoppers are substantially aligned with I the bevelled' sides 7 ofthe weights so; as to. form wedges. which, as. the :hoppersgclescend"throughj'the guide-wayd, push the pencils in I h thelattertowardsthehopper 2. Aconveying band 16 may be arranged in the guide-way 15 forfeeding-the pencils into the hopper 2, but. this conveying band beomitted if the guide-way is inclined so as to cause the pencils to rollalongit into the hopper 2.

Means may be provided for reversing the go pencils during the returntravel so that their I ends will be alternately leading and trailing onpassing through the polishing apparatus. For thispurpose the hoppers19are supported in the shafts 20 so as to be capable of rotation abouttheir vertical axes and connected to pmlons 23 whereby they can berotated. For

engagement with the 'pinions', ahorizontal rack 24 is carriedat the uplti er'elid'oi the frameli, the rack being adapted to turn the Weights eured to "the shafts;

I V o 1,887,266

' hoppers through 180 While they travel thrplugh the upper horizontalpart of the pat V In order to discharge from the hoppers 19pencils-Which fail to be taken up by'the guide- Way 15, an abutment 25is arranged at the foot of the frame 17 in position to engage and tripthe hopper. Another abutment 26 is provided for steadyng the hoppersbefore they reachvthe guide way 14. p

l/Ve claim A 1. In a lead pencil and like polishing maichine, a devicefor receiving the pencils from and returning them to the polishingappara- 5 tus, comprising a pair of guide-Ways ar= ranged in differentvertical planes and at difierent levels, one for feeding pencils to andthe other for delivering pencils from the polishing apparatus, eachguideway compris- 20 ing a pair of spaced angular members an endlesstravelling conveying element moving in a vertical plane and alonga'rectangular path in front'of and at right angles to said guideways,-and weight-balanced hoppers suspended pivot-ally from said' conveyingelement, each hopper comprising a pair of upwardly diverging Wingsarranged at right angles to said angular guide members and shorter thanthe space between said members, and said con- 1 kveying elementadaptedto pass the hoppers up through the delivery guides-Way for takingpencils therefrom,-and down through the'feed' guide-wayfor depositingthe pencils on the latter. Y 'F'J 2.- The structure claimed in claim 1in combination' with means-fortripping' the hoppers and means forsteadying thehoppers before they ascend through thedelivery guide-Way.3. A structure asclaimed'inclaim1Where in 'the hoppersand their balanceWeights are Wedge-shaped and have a feeding efi'ect-on'" thepencilsdisposed-in the-feed'guide-way:

4. A structure as claimed in claim 1 WllGI6-' in the hoppers arerotatable'aloout their -verti= cal axes, a pinion connected to eachhopper and centered in respect of the verticalaxis thereof; and ahorizontal rack arranged in theupper'horizontal path ofthe pinion; said9 rack adaptedto engage the pinions and turn' the hoppers through 180.

- FRIEDRICH "EHRHARDT.

CHRISTIAN ROEDER.

